Unless otherwise specified, Federal Airways include that Class E airspace extending upward from
A
700 feet above the surface up to and including 17,999 feet MSL.
B
1,200 feet above the surface up to and including 17,999 feet MSL.✓ Correct Answer
C
the surface up to and including 18,000 feet MSL.
Explanation
AIM 3-2-6 says that, unless otherwise specified, Federal airways are Class E airspace extending upward from 1,200 feet above the surface up to but not including 18,000 feet MSL (that is, through 17,999). 700 feet AGL is the floor used around some airports, and Class E does not extend through 18,000 feet, where Class A begins.
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